بهینه‌سازی کارایی علف‌کش‌های بنتازون + اسیفلورفن و ایمازتاپیر در کنترل سلمه‌تره (Chenopodium Album L.) با استفاده از مواد افزودنی

بهینه‌سازی مصرف علف‌کش‌ها به‌وسیله کاربرد مواد افزودنی یکی از رهیافت‌های نوین برای کاهش عوارض زیست‌محیطی ناشی از کاربرد علف‌کش‌ها است. به‌منظور ارزیابی تاثیر مواد افزودنی در بهینه‌سازی کارایی علف‌کش‌های بنتازون+اسیفلورفن و ایمازتاپیر در کنترل سلمه‌تره، دو آزمایش گلخانه‌ای دز ‌پاسخ مجزا در سال 1395 در گلخانه تحقیقاتی دانشکده کشاورزی بیرجند، به‌صورت فاکتوریل در قالب طرح کاملاً تصادفی با چهار تکرار انجام شد. تیمارها در هر آزمایش شامل غلظت‌های علف‌کش‌ در هفت سطح (0، 6.25، 12.5، 25، 50، 75 و 100 درصد توصیه ‌شده) و نوع ماده افزودنی در سه سطح (روغن منداب، سیتوگیت و بدون روغن) بود. نتایج آزمایش نشان داد که کاربرد مواد افزودنی بخصوص روغن گیاهی منداب موجب افزایش کارایی علف‌کش‌های بنتازون+اسیفلورفن و ایمازتاپیر در کنترل سلمه‌تره شد. روغن منداب و سیتوگیت باعث افزایش کارایی علف‌کش‌ بنتازون+اسیفلورفن در کاهش زیست‌توده تولیدی اندام‌های هوایی سلمه‌تره به‌ترتیب به میزان 1.29، 1.28 برابر و علف‌کش‌ ایمازتاپیر 2.13 و 1.30 برابر شد. در‌حالی‌که این مقادیر برای کاهش زیست‌توده ریشه سلمه تره به‌ترتیب 2.79، 1.98، 2.35 و 1.66 برابر بود. با توجه به واکنش شدیدتر ریشه به تیمارهای اعمال شده، نتایج نشان داد که ریشه سلمه‌تره حساسیت بیشتری به کاربرد مواد افزودنی و علف‌کش‌های بنتازون+اسیفلورفن و ایمازتاپیر در مقایسه با اندام‌های هوایی داشت. بطور کلی نتایج این مطالعه نشان داد که کاربرد روغن منداب و سیتوگیت باعث افزایش کارایی کنترل سلمه تره بوسیله بنتازون+اسیفلورفن و ایمازتاپیر می‌شود.

Optimizing the Performance of Bentazon+Acifluorfen and Imazethapyr on Chenopodium album L. (Common Lambsquarter) Control by Adjuvants

Introduction: Weed management is one of the most important aspects of successful crop production for supplying food for the rising population. Chenopodium album L. (common lambsquarter) is among the most noxious weeds in the world due to its superior biology and tremendous ecological adaptations. It causes substantial yield losses in different field crops including potato, tomato, soybean, alfalfa, watermelon, sugar beet, and so on. Therefore, management of C. album L. is crucial for optimum crop production. Chemical management is a very relevant method for controlling C. album. For decreasing costs of production, adverse and edge effects of the herbicide, optimizing herbicides performance is very essential. It seems that the use of adjuvants is the best solution method to achieve optimizing herbicides performance. Using a proper adjuvant may be affected the performance and fate of herbicide in the environment and finally may be restrict introduced to the food chain. Therefore, using proper adjuvants known as a key point in adjuvants applying technology. This study was conducted for evaluating adjuvants effects on C. album control by Bentazon+Acifluorfen and Imazethapyr herbicides.;Materials and Methods: In order to study the effects of adjuvants on the performance of Bentazon+Acifluorfen and Imazethapyr on C. album control two separated experiments as factorial based on completely randomized design were conducted in the research greenhouse of Faculty of Agriculture, University of Birjand in 2016. Treatments included herbicide concentration at seven levels (0, 6.25, 12.5, 25, 50, 75 and 100 % of recommended dose) and adjuvant at three levels (turnip oil, citogate and without adjuvants) with four replications. For increasing seed germination and breaking seed dormancy of C. album, the seeds treated by sulfuric acid for 1 min, and then seeds washed with tap water for 10 min. Then the seeds were sown in potting trays (3 cm × 3 cm × 5 cm) filled with moistened peat. One week after sowing, at the oneleaf seedlings stages, they were transplanted to 2L plastic pots filled with a mixture of sand, clay loam soil, and peat (1:1:1; v/v/v). The pots were subirrigated every two days. The seedlings were thinned to four per pot at the twoleaf stage. The spray was done at the fourleaf stage (Four weeks after sowing) by using a chargeable sprayer equipped with an 8002 flat fan nozzle tip delivering 250 L ha1 at 2 bar spray pressure. Four weeks after spraying, the above ground tissue and roots of plant were harvested, oven dried and weighted.;Results and Discussion: The results of these experiments showed that the use of additives, especially turnip oil, increased the efficacy of Bentazon+Acifluorfen and Imazethapyr herbicides in control of C. album. Turnip oil and citogate increased the efficiency of Bentazon+Acifluorfen and Imazethapyr in reducing the production of by C. album above ground tissue1.29, 1.28, 2.13, and 1.30 times, respectively. However, these values were equal to 2.79, 1.98, 2.35, and 1.66 times for reducing the root biomass of C. album. The results of this study also showed that the root was more susceptible to herbicides in the presence of adjuvants. Increasing Bentazon+Acifluorfen and Imazethapyr herbicides concentrations led to decreased dry biomass produced by C. album. Turnip oil compared to citogate showed high efficiency for improving Bentazon+Acifluorfen and Imazethapyr performance. The results of this study showed a similar trend with other scientific reports including Rashed mohassel et al (26) that reported the high efficiency of herbicides for controlling canary grass (Phalaris minor Retz.) in the presence of vegetable oils compared with mineral oils.;Conclusion: The result of this study showed different response of Bentazon+Acifluorfen and Imazethapyr to turnip oil and Citogate adjuvants. Therefore, applied proper herbicide adjuvant is a key factor in chemical weed management because this factor reduces herbicide rates for similar weed response. Using proper adjuvants may be increased herbicide performance more than other adjuvants. Moreover, results of these experiments revealed that root response was more than above ground tissue response to Bentazon+Acifluorfen and Imazethapyr herbicides in the presence of adjuvants.